Artificial-arm frame



A. HULSMANN.

ARTlHclAL ARM FRAME. APPLICATION FILED JULYI5|192- 1,399,622, Patented Dee. 6, 1921.

part ot this speciiication and in which lilre ITE were assisteren-anni iraniana -issaesaf Srpeccation of Letters Patent;

llmatented Desc..A G, 1W/31.

application niearaiy is, resi.. serial no. seance.

"cation This invention relates to a :trame for artiticial limbs especially artificial arms and has for its primary object to provide a 'trame ot this character which may be manufactured in less time than heretofore necessary in producing devices oi. this hind and with a consequent saving in labor and pro* duction cost in every particular.

A further object ot my invention is to produce an arm trarne in which the side arms and stump cover are made trom a single piece or sheet metal thus doing away with all useless connections and joints which not only add to the cost price ct the trame but result in inconvenience to the wearer.

Still another object of this invention is to produce a light yet exceedingly strong` and efficient Ytraine which. will meet all requirements of the user.

@ther objects and advantages will be apparent during the course of the following description.. y

'in the accompanying drawings forming a iuunerals are employed to designate like parts throughout the same,

F inure 1 is a view in perspective of the trame parts assembled,

21 is a plan view of one ot the upper side members,

Fig. 3 is a detail view taken on the line 3&3 of Fig. 2 showing the blank inFg. 2` bent upon itselt` to produce the relatively narrow upper side member,

Fig. l is a view in plan oi' the blank 'trom which the tore arm member of the iframe is made, and

Fig. 5 is the die ior bendingor :forming the stump cover of the iore arm trame.

In the accompanying drawings wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 1 designates a blank which is rst cut or stamped trom sheet metal to leave a semicircular part 2 intermediate the ends 3 ci? the strips l and 5. The part Q; is pro vided with an eye 6 and the ends 3 are lilreu wise made with eyes 7 and also with a slight shoulder 8` made by leaving an excessive width of metal for the ends.

` rllhis blanlrl after being cut as just described is introduced into a die press 9 with a pin 10 of the die engaging the eye 6 so as to center the part 2 whereupon applied pressure to the die will press the part 2 of the blank into a cup shaped stump cover as shown at 2a in Fig. l. The strips 4 and 5 beingy bent upwardly to leave the fore arm members la and 5a and with the eyes 7 in the ends 3 made to receive the headed pins 11 and 12 which pivotally connect the upper side members 13 and lll to the form arm members 4v and 5a the 'latter being,` made preferably as follows:

its shown in Fig. 2 a relatively wide blank 15 of the desired length is cut trom sheet metal the same being; cut wider at its bese 16 in which the two openings 17 are made, than at its top 18. titer being` thus cut and with the openings 17 made it is bent along a medial line as shown by the dotted line 19 so that the strip may be folded upon itself to leave a double thickness for the upper side members 13 and 1d. A. suitable bencing or 'folding` device is used in this operation so that the ends 2O of the members 13 and 111 include pockets to receive the en ds 3 ot the tore arm members la and 5L so that the eyes 7 therein and the eyes `made b f the openings 17 ma register to .l .s y c receive the head pins 11 and 12 in pivotally connecting the two sets oif members together. ln making' these poclrets the inside folds of each member continues straight but the `outside folds are bent slightly outward as at 21 and then downwardly in space relation from the outside folds.

lt can be seen from the above how easily and cheaply the trame may be made and how eiiicient it will work out in practice compared to those devices which have heretotore been used.

lt is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape,

size and arrangement et parts may be resorted to without departing from the spirit of the invention or the scope oi" the sub `ioined claims.

Having thus described my invention, ll claim 1. 1n an artificial arm :trame tore arm side'members produced from a single strip of material and including an integral stump cover, and upper side members pivotally connected to ends of the fore arm side members, said upper side members being produced from yseparate `sheet meta-l blanks each cover7 and Vupper side members pivotally` `connected to ends of the fore arm side members, said upper side members being produced from separate sheet metal blanks each 15 folded upon itself to produce a double thickness of metal for each member, and with the outside folds of each member bent out- Wardly and then downwardly in respect to their inside folds to leave pockets between 20 the folds to receive the ends of the fore arm side members substantially as and for the purpose described.

ln testimony whereof I aix my signature.

ANTON HULSMANN. 

